Testing is a potentially important intervention to slow the HIV epidemic in Africa and elsewhere. Some countries in Africa have achieved high levels of testing but most have not. Cost, price, and questions of confidentiality have limited the expansion of testing. It looks possible, however, that...

The paper demonstrates that the concepts of dynamic controllability are useful for the theory of economic policy by establishing four propositions. First dynamic controllability is a central concept in stabilization policy. Second, the ability to achieve a target state, even if it cannot be...